521294891 has 8 divisors (see below), whose sum is σ = 574450800. Its totient is φ = 470004192.

The previous prime is 521294881. The next prime is 521294929. The reversal of 521294891 is 198492125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 521294891 - 2¹⁸ = 521032747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521294801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465716 + ... + 466833.

It is an arithmetic number, because the mean of its divisors is an integer number (71806350).

Almost surely, 2^521294891 is an apocalyptic number.

521294891 is a deficient number, since it is larger than the sum of its proper divisors (53155909).

521294891 is a wasteful number, since it uses less digits than its factorization.

521294891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932605.

The product of its digits is 51840, while the sum is 41.

The square root of 521294891 is about 22831.8832118597. The cubic root of 521294891 is about 804.8120858140.

The spelling of 521294891 in words is "five hundred twenty-one million, two hundred ninety-four thousand, eight hundred ninety-one".